/*
 * Copyright (c) 2009, 2010, 2011 Nicira Networks.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef ODP_UTIL_H
#define ODP_UTIL_H 1

#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include "hash.h"
#include "openflow/openflow.h"
#include "openvswitch/datapath-protocol.h"
#include "util.h"

struct ds;
struct flow;
struct ofpbuf;

#define ODPP_NONE ((uint16_t) -1)

static inline uint16_t
ofp_port_to_odp_port(uint16_t ofp_port)
{
    switch (ofp_port) {
    case OFPP_LOCAL:
        return ODPP_LOCAL;
    case OFPP_NONE:
        return ODPP_NONE;
    default:
        return ofp_port;
    }
}

static inline uint16_t
odp_port_to_ofp_port(uint16_t odp_port)
{
    switch (odp_port) {
    case ODPP_LOCAL:
        return OFPP_LOCAL;
    case ODPP_NONE:
        return OFPP_NONE;
    default:
        return odp_port;
    }
}

int odp_action_len(uint16_t type);
void format_odp_action(struct ds *, const struct nlattr *);
void format_odp_actions(struct ds *, const struct nlattr *odp_actions,
                        size_t actions_len);

/* By my calculations currently the longest valid nlattr-formatted flow key is
 * 124 bytes long, so this leaves some safety margin.
 *
 * We allocate temporary on-stack buffers for flow keys as arrays of uint32_t
 * to ensure proper 32-bit alignment for Netlink attributes.  (An array of
 * "struct nlattr" might not, in theory, be sufficiently aligned because it
 * only contains 16-bit types.) */
#define ODPUTIL_FLOW_KEY_BYTES 144
#define ODPUTIL_FLOW_KEY_U32S DIV_ROUND_UP(ODPUTIL_FLOW_KEY_BYTES, 4)

void odp_flow_key_format(const struct nlattr *, size_t, struct ds *);

void odp_flow_key_from_flow(struct ofpbuf *, const struct flow *);
int odp_flow_key_to_flow(const struct nlattr *, size_t, struct flow *);

#endif /* odp-util.h */